Suction-pump.



N. H. FREEMAN.

SUCTION PUMP. APPLICATION FILED MAR.15,1009.

Patented Feb. 7, 1911.

' 2 SKEETS-SHEET 1.

N. H. FREEMAN.

SUCTION PUMP.

APPLICATION FILED MAB-.15, 190a.

Patented Feb.7, 1911.

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HUULDEE, COLOMBO.

SUCTION"-?UMI'.

Application filed March 15,

Specification of Letters Patent.

Patented Feb. *3, fill-til...

1999. Serial No. 483,624t.

To all whom it may concern:

Be it known that I, NAT I-i. FREEMAN, a citizen of the United States, residin at Boulder, in the county of Boulder and State of Colorado, have invented certain new and useitul improvements in Suction-Punu'is; add I do declare the following to he a :lull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertaius to make and use the same, reference being; bad to the accompany ing drawings, and to the letters and homes of reference marked thereon, which form it part of this specification.

My invention relates to iiuprM/eiueuls in air pumps, my present invention being here especially intended for use in connection with my improved apparatus for elevating liquids, and also in connection with my up paratus for the purification of liquids, dis closed in simultaneously pending applica tions. lt'is evident, however, that it may be employed in other relations where a similar function is to be performed.

My improved pump is provided with two cylinders, whose pistons are actuated by rods conuectetlwith a centrally located yoke having a slot in which the crank-pin ot an operativesha'tt travels. The outer extremities of the two cylinders are in communication with a suction chamber from which the air is continually exhausted for the use of suitable check valves arranged in the pistons, and. also at the opposite extremities of the cylind-ears.

illaving briefly outlined my improved con structiou, I. will proceed to describe the same in detail, reference losing made to the accord panying drawing, in which is illustrated an embodiment thereof.

In this drawing-Figure 1 is a side elevation of my improvedsuction pump. Fig. 2 is a section of one'of the check valves located in the piston, the said valve in this view being shown indetail and on a larger scale than in Fig.1. Fig. 3 is a cross-section taken through one of the cylinders on the line 3-3, Fig. l. Fig. 4t is a top plan view of the pump, showing the cylinders in 1ongitudinal section. Figs. 5 and 6 are sections illustrating the check valves located in the opposite extremities of the cylinder heads.

The same reference characters iridicate the Let the numeral 5 designate a base-plate upon which are mounted two cylinders (i,

stem.

' the construction shown in lii each of which has a istou 7 connected with a rod 8, the two rods ciug rigidly com'tccted with a cent ally located yoke 9, which is ver tically slotted, as shown at 10, to receive a box 12 in which a pin 13 of a crank let is journaled. The crank 1-1 is carried by an operating crank shaft to )I'()Vi.l0tl with fast and loose pulleys 16. At t e outer extremity of each cylinder an auxiliary chamber 1.? l'o'rmed, which is in oouunuuicatiou, by means of a branch. lit, with a main suittiou pipe l9, having a branch coum'uulicatiugl; with an exhaust tank 21.

Each. piston 7 is equipped with a number of reversible cheek-valves 22 oi the construction shown in Fig. 2. llach of these valves has a valve-piece S33, astcuz fit, a casing -55, :1 guide 26 and a spring 97 interposed bctuwen the said oids and itWllSlllEl eiw'ae'uw a O I.) to

out 29 screwed upon one extremity of the These cl1eclr-valves are so arranged in the pistons that as the latter move out-- wardly, their valves open and. allow the air to pass inwardly or in a direction toward the operating shaft, while, when these pistons are moving in the opposite direction or inwardly toward the operating shaft, their valves rcinaiuclosed and drive the air out of the cylinders into the utn'xosphero through reversible valves 30 located in the inner heads of the pistons, these valves beiu ol' 5 and c, and being substantiall of the some construction as the piston va vcs, each being pi'buuled 'with a valve-piece 31, a guide 232, a ca mfg; 33,

a spring; and a stem 35. The wring; ill is, interposed between the guide 2"):3 and a 'wasli'er tit) engaging a nut 2&7 screwed upon the threaded extremity of the stem. The outer head 38 of each cylinder is also equipped with valves 30. These reversible valves, however, are arranged to open as the pistons move inwardly toward the operating shaft and close as the pistons move in the opposite direction.

The valves 22 and 30 are located in an ex teriorly threaded valvecasing adapted to be threaded into correspondiu 1y threaded sockets in the pistons and cy inder casings respectively, whereby the valves army he removed and reversed by threadlug them into the opposite side of their sockets, thus re-x till during the operation of the pump, 'both pistons are moving in the same direction. One, however, is moving outwardly 1n its cylinder While the other is moving inwardly.

During this outward movement of the one.

cylinder the valves 30 in its outer head are closed, and the air in the outer end of the cylinder passes through the check-valves 22 into the inner extremity of the cylinder. During this operation the piston in the 0pposite cylinder is driving the air out of the valves 30 located in the inner extremity of the last named cylinder; While, when the pistons are moving in the op osite direction,

their functions are reverse In this way inders, pistons therein, each cylinder having an auxiliary chamber beyond its outer head, a conduit in communication with both auxiliary chambers, reversible checkvalves located in the outer heads of both cylinders, whereby the latter are placed in communication with the auxiliary chambers, the in ner heads of the cylinders having reversible check valves, whereby the latter are placed in communication with the atmosphere, the cylinder pistons also having reversible check valves, a centrally located operating yoke, and a rigid connection between the two pistons and the yoke, substantially as described.

2. A suction pump, comprising two cylinders, pistons therein, each cylinder having an auxiliary chamber beyond its outer head,

a conduit in communication with both auxiliary chambers, reversible check valves located in the outer heads ofboth cylinders,

opposite directions, substantially as de scribed. I

3. 'A pump comprising two cylinders, pistons therein, each cylinder having an auxiliary chamber beyond its outer head,.a conduit in communication with both of the cylinders, reversible check valves located in the.

outer heads of both cylinders, whereby the latter are placed in communication with the auxiliary chambers, the inner heads of the cylinders having reversible check valves, the cylinder pistons also having reversible check valves, whereby the pump is adapted to produce either-a suction or compression of fluid and means for simultaneously actuating the pistons, for the purpose set forth.

4. Asuction pump comprising a cylinder, a piston mounted to reciprocate therein, a conduit incommunication with the cylinder, a reversible check valve located in the outer head of the cylinder, the inner head of the cylinder also having reversible check valves, thereby the said pump is ada ted to cause either a suction or compression, the piston also having reversible check valves, and suitable means for operating the piston, for the purpose set forth.

In testimony whereof I attix in presence of two witnesses.

NAT H. FREEMAN. Witnesses my signature 

